https://github.com/sirjuddington/SLADE/pull/1413

diff --git a/src/Application/App.cpp b/src/Application/App.cpp
index dddaf875..ede8d73c 100644
--- a/src/Application/App.cpp
+++ b/src/Application/App.cpp
@@ -60,7 +60,7 @@
 #include "UI/WxUtils.h"
 #include "Utility/StringUtils.h"
 #include "Utility/Tokenizer.h"
-#include "thirdparty/dumb/dumb.h"
+#include <dumb.h>
 #include <filesystem>
 
 using namespace slade;
diff --git a/src/Audio/ModMusic.cpp b/src/Audio/ModMusic.cpp
index cc4b60cf..6d54516d 100644
--- a/src/Audio/ModMusic.cpp
+++ b/src/Audio/ModMusic.cpp
@@ -32,7 +32,7 @@
 // -----------------------------------------------------------------------------
 #include "Main.h"
 #include "ModMusic.h"
-#include "thirdparty/dumb/dumb.h"
+#include <dumb.h>
 
 using namespace slade;
 using namespace audio;
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index fef3d009..00dbb018 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -116,7 +116,6 @@ include_directories(
 	${MPG123_INCLUDE_DIR}
 	.
 	..
-	../thirdparty/dumb
 	../thirdparty/glad/include
 	./Application
 	)
@@ -235,7 +234,7 @@ else(APPLE)
 		install(FILES "${SLADE_OUTPUT_DIR}/slade.pk3"
 			DESTINATION share/slade3
 			)
-		
+
 		install(FILES "${PROJECT_SOURCE_DIR}/dist/res/logo_icon.png"
 			DESTINATION share/icons/
 			RENAME net.mancubus.SLADE.png
diff --git a/src/General/CVar.cpp b/src/General/CVar.cpp
index 460a7852..5e171446 100644
--- a/src/General/CVar.cpp
+++ b/src/General/CVar.cpp
@@ -32,7 +32,7 @@
 // -----------------------------------------------------------------------------
 #include "Main.h"
 #include "Utility/StringUtils.h"
-#include "thirdparty/fmt/include/fmt/format.h"
+#include <fmt/format.h>
 
 using namespace slade;
 
diff --git a/src/General/Log.cpp b/src/General/Log.cpp
index 9ad0718f..8d39f644 100644
--- a/src/General/Log.cpp
+++ b/src/General/Log.cpp
@@ -31,8 +31,8 @@
 // -----------------------------------------------------------------------------
 #include "Main.h"
 #include "App.h"
-#include "thirdparty/fmt/include/fmt/chrono.h"
-#include "thirdparty/fmt/include/fmt/format.h"
+#include <fmt/chrono.h>
+#include <fmt/format.h>
 #include <fstream>
 
 using namespace slade;
diff --git a/src/TextEditor/TextStyle.cpp b/src/TextEditor/TextStyle.cpp
index 09f4e405..ad51ec0a 100644
--- a/src/TextEditor/TextStyle.cpp
+++ b/src/TextEditor/TextStyle.cpp
@@ -43,7 +43,7 @@
 #include "Utility/Parser.h"
 #include "Utility/StringUtils.h"
 #include "Utility/Tokenizer.h"
-#include "thirdparty/fmt/include/fmt/format.h"
+#include <fmt/format.h>
 
 using namespace slade;
 
diff --git a/src/UI/Browser/BrowserItem.cpp b/src/UI/Browser/BrowserItem.cpp
index 89c0f39c..3f056f71 100644
--- a/src/UI/Browser/BrowserItem.cpp
+++ b/src/UI/Browser/BrowserItem.cpp
@@ -126,7 +126,7 @@ void BrowserItem::draw(
 		// Create text box if needed
 		if (!text_box_)
 			text_box_ = std::make_unique<TextBox>(
-				fmt::format("{}\n{}", index_, name_.c_str()), font, ui::scalePx(144), ui::scalePx(16));
+				fmt::format("{}\n{}", index_, name_.mb_str()), font, ui::scalePx(144), ui::scalePx(16));
 
 		int top = y;
 		top += ((size - text_box_->height()) * 0.5);
diff --git a/src/UI/SToolBar/SToolBar.cpp b/src/UI/SToolBar/SToolBar.cpp
index f38710ad..c002bf97 100644
--- a/src/UI/SToolBar/SToolBar.cpp
+++ b/src/UI/SToolBar/SToolBar.cpp
@@ -219,7 +219,7 @@ void SToolBarGroup::hide(bool hide)
 
 	// Update 'hidden toolbars' cvar
 	string tb_hidden = toolbars_hidden;
-	auto   name      = fmt::format("[{}]", name_.c_str());
+	auto   name      = fmt::format("[{}]", name_.mb_str());
 	if (hide)
 		tb_hidden += name;
 	else
diff --git a/src/common.h b/src/common.h
index 8c3c4b3b..d66cbc04 100644
--- a/src/common.h
+++ b/src/common.h
@@ -129,7 +129,7 @@
 #endif
 
 // fmt
-#include "thirdparty/fmt/include/fmt/core.h"
+#include <fmt/core.h>
 
 // Sigslot
 #include "thirdparty/sigslot/signal.hpp"
diff --git a/thirdparty/CMakeLists.txt b/thirdparty/CMakeLists.txt
index f84cfc8a..6cb9e0af 100644
--- a/thirdparty/CMakeLists.txt
+++ b/thirdparty/CMakeLists.txt
@@ -6,20 +6,33 @@ find_package(BZip2 REQUIRED)
 set(ZLIB_LIBRARY ${ZLIB_LIBRARY} PARENT_SCOPE)
 set(BZIP2_LIBRARIES ${BZIP2_LIBRARIES} PARENT_SCOPE)
 
+option(USE_SYSTEM_DUMB "Use system DUMB library" OFF)
+if(USE_SYSTEM_DUMB)
+	pkg_check_modules(DUMB REQUIRED IMPORTED_TARGET dumb>=1.0)
+else()
+	file(GLOB_RECURSE DUMB_SOURCES dumb/*.c)
+endif()
+
 # Roll the rest up into a big ball and compile it by itself
 set(EXTERNAL_SOURCES
 )
 file(GLOB_RECURSE EXTERNAL_SOURCES
-	dumb/*.c
 	lzma/C/LzmaDec.c
 	mus2mid/mus2mid.cpp
 	zreaders/*.cpp
 	glad/src/*.c
+	${DUMB_SOURCES}
 	${SLADE_HEADERS}
 	)
 
 # Add fmt
-add_subdirectory(fmt)
+option(USE_SYSTEM_FMT "Use system fmt library" OFF)
+if(USE_SYSTEM_FMT)
+	find_package(fmt REQUIRED)
+else()
+	add_subdirectory(fmt)
+	target_include_directories(fmt INTERFACE ${CMAKE_CURRENT_LIST_DIR}/fmt/include)
+endif()
 
 # Add lunasvg
 add_library(lunasvg STATIC)
@@ -29,5 +42,11 @@ add_subdirectory(lunasvg/3rdparty/software)
 add_subdirectory(lunasvg/3rdparty/plutovg)
 
 add_library(external STATIC ${EXTERNAL_SOURCES})
-target_link_libraries(external ${ZLIB_LIBRARY} lunasvg fmt ${CMAKE_DL_LIBS})
+target_link_libraries(external ${ZLIB_LIBRARY} lunasvg fmt::fmt ${CMAKE_DL_LIBS})
 set(EXTERNAL_LIBRARIES external PARENT_SCOPE)
+
+if(USE_SYSTEM_DUMB)
+	target_link_libraries(external PkgConfig::DUMB)
+else()
+	target_include_directories(external PUBLIC ${CMAKE_CURRENT_LIST_DIR}/dumb)
+endif()